Best AI email assistant for Gmail: MailMaestro vs Gemini

Your inbox is full, and the reply you need to write is sitting there half-finished. Maybe you open a new tab, describe what you need to ChatGPT, then copy the draft back into Gmail. It works, but it breaks your flow every time, and it means pasting someone else's email into a tool that has nothing to do with your inbox.

Gmail doesn't include a real AI writing assistant for free. Gemini in Gmail exists, but only if you're paying for it, either through a Google Workspace plan or a Google AI Pro subscription (formerly Google One AI Premium). For everyone else, Gmail is still a blank compose box.

This guide covers what to look for in an AI email assistant for Gmail, how MailMaestro, Gemini in Gmail, and ChatGPT actually compare, and how to get started in a few minutes.

Is there an AI for Gmail?

Yes, in 2 ways. You can install a free extension like MailMaestro that adds AI directly into Gmail's compose window and inbox, or you can pay for Gemini in Gmail through a Google Workspace plan or a Google AI Pro subscription (formerly Google One AI Premium). Gmail's free tier doesn't include AI features on its own.

What to look for in an AI email tool for Gmail

Not every "AI for Gmail" tool actually works inside Gmail. Some are separate apps that connect to your account through an API and expect you to work from their interface instead of yours. A few are just wrappers around ChatGPT with an extra login screen.

Three things separate the tools worth using from the ones that add a step instead of removing one:

It writes inside the compose window, not next to it. You should be able to click compose, get a draft, and send, without switching screens.

It reads the thread you're replying to. A generic AI tool has no idea what the last few emails in that conversation said. A Gmail-native assistant does, because it's reading the same inbox you are.

It works the way you already work. If you're used to Gmail's layout and shortcuts, the assistant should sit inside that, not replace it.

MailMaestro: an AI email assistant built for Gmail (and Outlook)

MailMaestro installs as a browser extension and adds an AI panel directly into Gmail's compose window and inbox view. There's no separate app to open and no dashboard to check. You write an email the same way you always have, except now there's a button that drafts it, replies to it, or shortens it for you.

The same extension works in Outlook, which matters if your company runs on Microsoft 365 for some accounts and Gmail for others. You're not learning 2 separate tools or paying for 2 separate subscriptions to get the same AI help in both inboxes.

Key use cases: drafting, replying, summarizing threads, and changing tone

Drafting from scratch. Instead of staring at a blank compose window, type a 1-line prompt describing what you need, and MailMaestro writes a full draft you can edit before sending.

Drafting a cold outreach email

Prompt: "Write a short email to Priya at Northfield Group introducing our new inventory software and asking for a 15-minute call next week."

Subject: Quick call about inventory tracking at Northfield Group?

Draft: "Hi Priya, I noticed Northfield Group has been expanding its retail locations this year, and I think our inventory software could save your team a few hours a week on stock tracking. Would you have 15 minutes next week for a quick call? I'm free Tuesday or Thursday afternoon."

Replying to a thread. MailMaestro reads the email you're responding to and drafts a reply that actually addresses what was asked, instead of a generic response you'd have to rewrite anyway.

Summarizing long threads. A 20-message thread about a project delay takes 10 minutes to read properly. MailMaestro condenses it into a few bullet points: what was decided, what's still open, and who owns the next step. If you manage long-running threads every week, MailMaestro's email summary feature turns that read into a 30-second scan.

Summarizing a long thread

A 22-message thread about a delayed shipment, condensed to:

• Northfield Group's order is delayed 2 weeks due to a supplier issue.
• David already approved a partial shipment for Friday.
• Still open: confirming the new delivery date with the warehouse team.

Changing tone. The same draft can read as formal, casual, or direct, with 1 click, instead of rewriting the whole email because your first pass sounded too stiff for a colleague you know well.

Gemini in Gmail: Google's built-in option (and its paywall)

Google has its own answer to this problem. Gemini in Gmail can draft emails, summarize threads, and suggest replies through the "Help me write" panel. Since January 2025, Gemini comes bundled into every paid Google Workspace Business plan, though how much you get varies. Business Starter includes basic "Help me write" in Gmail, while Business Standard and above unlock the fuller set of Gemini features across Gmail, Docs, and Sheets. On a personal account, you need a Google AI Pro subscription (Google's current name for what used to be Google One AI Premium). None of it is part of Gmail's free tier.

If your company already pays for a Workspace Business plan, or you've subscribed to Google AI Pro, Gemini in Gmail is a reasonable built-in option. If neither applies, it simply isn't there. That's the gap tools like MailMaestro are built to fill, without requiring you to pay Google first.

MailMaestro vs. Gemini in Gmail vs. copy-pasting into ChatGPT

Three ways to get AI help in Gmail right now, and how they actually compare:

MailMaestro. Works inside Gmail's compose window on any Gmail account, free or paid. Reads the thread you're replying to. Also works in Outlook.

Gemini in Gmail. Works inside Gmail, but only on a paid Workspace or Google AI Pro plan (formerly Google One AI Premium). Reads the thread you're replying to. Gmail only.

Copy-pasting into ChatGPT. Works with any Gmail account, but requires switching tabs and manually copying the email content. Doesn't see your inbox or thread history unless you paste it in yourself.

How to add an AI email assistant to Gmail

Head to the Chrome Web Store, search for MailMaestro (or another Gmail AI assistant), and click Add to Chrome. Open Gmail and sign in, and the AI panel appears in your compose window and next to messages in your inbox right away, with no separate dashboard to configure.

If you'd rather use Gemini in Gmail, you don't need to install anything separately. It appears inside Gmail automatically once your organization's paid Workspace Business plan or your personal Google AI Pro subscription is active.

Common mistakes when choosing an AI email assistant for Gmail

Assuming Gemini in Gmail is free. It isn't, on either a Workspace plan or a Google AI Pro subscription (formerly Google One AI Premium). Check what your organization already pays for before assuming it's included.

Picking a tool that requires switching to an entirely new email client. That solves a different problem than "I want AI help writing email," and it costs you your existing shortcuts and setup.

Copy-pasting sensitive email content into a general chat tool. It works, but it means sending someone else's email outside your inbox every time, to a tool that never sees the full thread anyway.

Does an AI email assistant for Gmail also work in Outlook?

With MailMaestro, yes. The same extension works in both Gmail and Outlook, so you get the same drafting, replying, and summarizing features no matter which inbox you're in, without paying for or learning 2 separate tools.

If you want to stop copy-pasting between Gmail and a chat tab, MailMaestro drafts, replies, and summarizes right where you're already writing. Add it free.